Help, need advice

I had unprotected sex day 22 of my cycle, we used withdrawal method however he did not finish... I then got my period 2 days earlier but on the 25 day of my cycle. I then began my birth control pill that day as instructed. My period was lighter but still got painful cramps. It also ended on cycle day 6 which is today. I am feeling sick and getting some pelvic cramps. Also I've got sore boobs. Can these be signs of Starting the pill or can I possibly be pregnant